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593D476X9016D2W Datasheet(PDF) 5 Page - Texas Instruments |
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593D476X9016D2W Datasheet(HTML) 5 Page - Texas Instruments |
5 / 18 page TPS6735 FIXED NEGATIVE 5V 200mA INVERTING DC/DC CONVERTER SLVS141A − JULY 1996 − REVISED JANUARY 1997 5 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443 SS clamp The SS clamp circuit limits the signal level on error-amplifier output during start-up. The voltage on SS is amplified and used to override the error-amplifier output until it rises above that output, at which point the error amplifier takes over. This prevents the input to the PWM comparator from exceeding its common-mode range (i.e., error amplifier output too high to be reached by the current ramp) by limiting the maximum voltage on the error-amplifier output during start-up. Soft start causes the output voltage to increase to the regulation point at the controlled rate. The voltage on the charging soft-start capacitor gradually raises the clamp on the error amplifier output voltage, limiting surge currents at power up by increasing the current limit threshold on a cycle-by-cycle basis. A soft-start cycle is initiated when either the enable (EN) signal is switched high or an overcurrent fault condition triggers the discharge of the soft-start capacitor. undervoltage lockout (UVLO) The supply voltage is fed through a voltage divider to the input of the UVLO and compared to a reference. The undervoltage-lockout logic prevents the MOSFET from turning on while the supply voltage is below the undervoltage-lockout voltage threshold, and once the supply voltage on VCC is above the threshold, an SS cycle is initiated. DISSIPATION RATING TABLE PACKAGE TA ≤ 25°C POWER RATING DERATING FACTOR ABOVE TA = 25°C TA = 70°C POWER RATING TA = 85°C POWER RATING D 725 mW 5.8 mW/ °C 464 mW 377 mW P 1175 mW 9.4 mW/ °C 752 mW 611 mW absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Pin voltages: VCC (see Note 1) −0.3 V to 7 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . OUT to VCC 12.5 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FB (see Note 1) 25 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SS, COMP, EN voltage range (see Note 1) −0.3 V to VCC +0.3 V . . . . . . . . . . . . . . . . . . . . Peak switch current 2 A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Reference current 2.5 mA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous total power dissipation See Dissipation Rating Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operating free-air temperature range, TA −40 °C to 85°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Storage temperature range, Tstg −65 °C to 150°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lead temperature 1,6mm (1/16 inch) from case for 10 s 260 °C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltage values are with respect to network terminal ground. recommended operating conditions MIN NOM MAX UNIT Supply voltage 4 6.2 V Decoupling capacitor 1 µF Input capacitor 47 µF Reference capacitor 10 µF Output capacitor 100 µF Compensation capacitor 82 pF Inductor 10 µH |
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